Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
  • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
  • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
  • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
  • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
  • G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
  • G01N33/54306—Solid-phase reaction mechanisms
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
  • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
  • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
  • G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
  • G01N33/554—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals the carrier being a biological cell or cell fragment, e.g. bacteria, yeast cells
  • G01N33/555—Red blood cell
  • G01N33/556—Fixed or stabilised red blood cell
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
  • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
  • G01N33/58—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving labelled substances
  • G01N33/585—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving labelled substances with a particulate label, e.g. coloured latex
  • G01N33/586—Liposomes, microcapsules or cells
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S436/00—Chemistry: analytical and immunological testing
  • Y10S436/807—Apparatus included in process claim, e.g. physical support structures
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S436/00—Chemistry: analytical and immunological testing
  • Y10S436/815—Test for named compound or class of compounds
  • Y10S436/816—Alkaloids, amphetamines, and barbiturates
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S436/00—Chemistry: analytical and immunological testing
  • Y10S436/815—Test for named compound or class of compounds
  • Y10S436/817—Steroids or hormones
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S436/00—Chemistry: analytical and immunological testing
  • Y10S436/822—Identified hapten
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S436/00—Chemistry: analytical and immunological testing
  • Y10S436/901—Drugs of abuse, e.g. narcotics, amphetamine

Definitions

• This invention relates to the field of immunoassays.
• In-vitro diagnostic tests via immunoassays typically involve antibodies with specific binding affinity toward the analytes of interest.
• antigenic analytes either bind directly with the antibody or compete with a hapten- label conjugate (competition assay).
• the antibody-antigen complex may be allowed to grow as in agglutination assays.
• sandwich assays another antibody with affinity to the antigen can be conjugated to a signal label and allowed to bind the primary antibody-antigen complex.
• the signal response is directly proportional to the analyte concentration.
• competition assays competition is established between the analytes, typically small molecules in nature, and the hapten-label conjugates. The signal response is inversely proportional to the analyte concentration.
• target analytes can, in principle, be detected using either the competition assay or the sandwich assay format. While there are numerous examples where the stated methods served the purpose very well, the utility of these approaches however, were somewhat limited in that a single assay is specific for a single analyte only. A multi-analyte assay is difficult.
• U.S. Pat. No. 4,185,084 to Mochida et al. discloses non-homogeneous assays with wash and separation steps.
• An insolubilized anti-analyte antibody acts as a primary capture phase for the analyte which is conjugated to a hapten (hapten-analyte conjugate).
• hapten-analyte conjugate After washing, soluble labelled anti-hapten antibody is added and the complex of (anti-analyte antibody/hapten-analyte conjugate/anti-hapten antibody) is detected.
• U.S. Pat. No. 4,243,749, to Sadeh et al. discloses another similar sandwich assay format.
• Sadeh et al. is specifically oriented towards measuring low molecular weight (hapten) antigens.
• the unknown analyte and the hapten-analyte conjugate are incubated together with the insoluble anti-analyte antibody in a competitive assay format.
• soluble labeled anti-hapten antibody is added and the system is washed again and the labeled complex of (anti- analyte antibody/hapten-analyte conjugate/anti-hapten antibody) detected.
• Kang et al., Clin. Chem.. 32(91:1682-1686 (1986) describes two assay formats.
• the first assay format presents an enzyme immunoassay which uses an anti-hapten antibody coated microparticle (the common capture particle), an anti- analyte antibody conjugated to a hapten (hapten-anti-analyte-antibody conjugate), and a labeled anti-analyte antibody. If the analyte is present in a sample, a complex of (anti-hapten antibody coated microparticle/hapten-anti-analyte-antibody conjugate/analyte/labeled anti-analyte antibody) is formed and detected. Fluorescein serves as the capture hapten.
• the microparticle is a latex particle. Kang et al.'s second assay format is similar to that of Bunting, U.S. Pat. No.
• the assay format consists of an anti-hapten antibody bound to a solid phase, a hapten conjugated to an anti-analyte antibody (hapten-anti-analyte antibody) and labeled analyte. The complex of all three components are detected.
• either the antibodies or the antigens (or hapten) may be bound to small particles.
• the particles that have been used as agglutable carriers include latex, charcoal, kaoiinite, bentonite, inorganic colloidal particles, as well as both microbial cells and erythrocytes. See Mochida, U.S. Pat. No. 4,308,026. When these coated particles (coated with either antibodies or antigens) are mixed with samples containing antigens or antibodies, the coated particles would form visually detectable agglutination. Agglutination is characterized by the clumping of the latex polymer particles from an otherwise smooth suspension.
• erythrocyte agglutination assay in which the agglutination reagent comprises at least one erythrocyte binding molecule coupled to at least one specific analyte binding molecule wherein the erythrocyte binding molecule does not cause agglutination when incubated with erythrocytes in the absence of analyte (in the case of a direct assay) or analyte binding reagent (in the case of an indirect assay).
• the erythrocytes are preferably endogenous to the blood sample to be tested.
• This cross reactivity may be undesireable because structurally similar, but non-related molecules are recognized by the antibody. This reduces the apparent specificity of the antibody and therefore reduces the specificity of any diagnostic test which uses that antibody. Diagnostic tests fail to teach a method for mixing two or more antibodies (antisera) which each have different patterns of cross reactivity, to obtain a common antibody pool which does not display the cross reactivity of either of the original antibodies.
• the immunoassay uses an anti-hapten antibody (ocH), a hapten conjugated to an analyte (H-A), and an anti-analyte antibody ( ⁇ A). If the analyte is not present in the sample, a complex of ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ is formed. If the analyte is present in the sample, the analyte will compete with (H-A) for ( ⁇ A), to form the complex of ⁇ ( ⁇ A)(A) ⁇ .
• ocH anti-hapten antibody
• H-A hapten conjugated to an analyte
• ⁇ A anti-analyte antibody
• ⁇ ( ⁇ H)(H- A)( ⁇ A) ⁇ or ⁇ ( ⁇ A)(A) ⁇ is detected or measured.
• the amount of ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ is inversely proportional to the amount of analyte in the sample, whereas the amount of ⁇ (ocA)(A) ⁇ is directly proportional to the presence of the analyte in the sample.
• the above assay can be presented in an agglutination assay format wherein the anti-hapten antibody is coated onto a particle, preferably a microparticle. in this case, a separation step is not required.
• a separation step is not required.
• A)( ⁇ A) ⁇ can be visually detected in the agglutination of the coated particles.
• Another embodiment of the present invention presents methods of improved immunoassays utilizing a dual antibody format.
• the dual antibody format tests for the presence of an analyte (A) in a test sample with the use of at least one other antibody ( ⁇ B) with a different specificity for analyte (A).
• the dual antibody format can detect or measure the amount of an analyte (A) in the presence of interfering substances (X) in the test sample.
• the analyte or an analyte analog (A) can be attached directly or indirectly to a solid phase, e.g., a microparticle.
• the amount of complexes ⁇ (P-A)( ⁇ A) ⁇ , or ⁇ (P-A)( ⁇ B) ⁇ , or ⁇ (P-A)( ⁇ A) ( ⁇ B) ⁇ , or combinations of the three complexes is inversely proportional to the amount of analyte (A) in the test sample.
• Another embodiment of present invention uses an anti-hapten antibody ( ⁇ H) attached to a microparticle, a hapten conjugated to an analyte (H-A), and two or more anti-analyte (A) antibodies ( ⁇ A) and ( ⁇ B).
• ⁇ H anti-hapten antibody
• H-A hapten conjugated to an analyte
• A anti-analyte
• ⁇ B anti-analyte
• A) ( ⁇ A) ⁇ , or ⁇ ( ⁇ H) (H-A) ( ⁇ B) ⁇ , or ⁇ ( ⁇ H) (H-A)( ⁇ A)( ⁇ B) ⁇ , or combinations of the three complexes is inversely proportional to the amount of analyte (A) in the test sample.
• Another aspect of the invention presents the preceding agglutination assays with the addition of particles not coated with the anti-hapten antibodies, the color of the coated and uncoated particles are such that they enhance visualization of the agglutination or lack thereof.
• Another aspect of the invention presents multi-analyte assays which employ anti-hapten antibodies attached to a solid phase, and the solid phase is preferably a particle.
• the multi-analyte assays can be conducted in competitive agglutination assay formats.
• Another aspect of the invention presents reagents and kits for conducting the above assays.
• Another aspect of the invention presents a multi-analyte assay device with different chambers, wherein each chamber contains a reagent for a specific analyte, and the reagent is a hapten conjugated to the specific analyte to be assayed.
• Another aspect of the invention presents dyed and preferably fixed erythrocytes which have been coated with anti-hapten antibodies, and can be used in agglutination assays. Also presented are: agglutination assay kits containing the dyed and coated erythrocytes, and compositions comprising dyed and coated erythrocytes for use in agglutination assays.
• Figure 1 illustrates the agglutination of anti-hapten microparticies in the absence of analytes.
• Figure 2 illustrates the inhibition of agglutination in the presence of analytes.
• Figures 3A and 3B illustrate an example of a multi-analyte assay device.
• Fiqure 4 illustrates a sandwich assay format for the antibody test.
• Figure 5 presents photographs of the negative, threshold, and positive reactions in drug assays.
• Figures 6-9 describe the dual antibody format:
• Figure 6 illustrates the situation where there is an absence of analyte in the dual antibody format. Therefore both antibodies in the dual antibody format form the agglutination reaction.
• Figure 7 illustrates the situation where structurally related substances present in the test sample can be bound by one of the antibodies in the dual antibody format and still get agglutination.
• Figure 8 illustrates the situation where a different structurally related substance can be bound by the other antibody in the dual antibody format and still get agglutination.
• Figure 9 illustrates the situation where analyte is present in the test sample.
• Both antibodies in the dual antibody format bind the analyte and no agglutination occurs.
• the invention presents an immunoassay for an analyte (A).
• the immunoassay uses an anti-hapten antibody ( ⁇ H), a hapten conjugated to an analyte (H-A), and an anti-analyte antibody ( ⁇ A).
• the ( ⁇ A) can be labelled to allow for detection. If the analyte is not present in the sample, a complex of ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ is formed. If the analyte is present in the sample, the analyte will compete with (H-A) for ( ⁇ A) , to form the complex of ⁇ ( ⁇ A)(A) ⁇ .
• the complex of ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ is then separated from the uncomplexed (H-A), ( ⁇ A) , or the complex of ⁇ ( ⁇ A)(A) ⁇ , if any.
• the presence of ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ or ⁇ ( ⁇ A)(A) ⁇ is then detected or measured.
• the amount of ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ is inversely proportional to the amount of analyte in the sample, whereas the amount of ⁇ ( ⁇ A)(A) ⁇ is directely proportional to the presence of the analyte in the sample.
• the above assay can be conducted in a competitive assay format, whereby the anti-hapten antibody can be attached to a solid phase.
• the above assay can also be presented in an agglutination assay format wherein the anti-hapten antibody is coated onto a particle, preferably a microparticle. In agglutination assays, no separation steps are required. The formation of the complex of ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ can be visually detected in the agglutination of the coated particles.
• the invention also presents methods of improved immunoassays for an analyte
• the use of at least one other antibody ( ⁇ B), creates a dual antibody format for detecting the presence or quantifying the amount of analyte (A) in the presence of interfering substances in a test sample.
• interfering substances can be structurally related substances which the antibodies in the dual antibody format show some level of cross reactivity.
• the dual antibody format can also utilize an anti-hapten antibody ( ⁇ H), a hapten conjugated to an analyte (H-A), and at least two anti-analyte (A) antibodies ( ⁇ A) ( ⁇ B ) .
• a method of utilizing at least two antibodies ( ⁇ A and ⁇ B) with different specificities for analyte (A) is employed. If the analyte (A) is not present in the test sample, an agglutination reaction occurs due to the interaction of the anti-hapten antibody ( ⁇ H), hapten- analyte conjugate (H-A), and the antibodies ( ⁇ A and ⁇ B) with different specificities for analyte (A).
• the antibodies ( ⁇ A and ⁇ B) specific for analyte (A) bind the analyte in the conjugate and accordingly, the complexes formed are ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ , or ⁇ ( ⁇ H)(H-A)( ⁇ B) ⁇ , or ⁇ ( ⁇ H) (H-A)( ⁇ A)( ⁇ B) ⁇ or combinations of the three complexes.
• the amount of complexes is inversely proportional to the amount of analyte (A) in the test sample.
• the analyte (A) is detected when it is present in the test sample.
• the analyte (A) will compete with (H-A) for ( ⁇ A) and ( ⁇ B), to form the complexes of ⁇ ( ⁇ A)(A) ⁇ and ⁇ ( ⁇ B)(A) ⁇ .
• the presence of ⁇ ( ⁇ H) (H-A) ( ⁇ A) ⁇ , or ⁇ (oH)(H-A)( ⁇ B) ⁇ , or ⁇ ( ⁇ H) (H-A) ( ⁇ A)( ⁇ B ) ⁇ or combinations of the three complexes is detected or measured.
• ⁇ ( ⁇ H) ( H-A) (oA) ⁇ , or ⁇ ( ⁇ H) ( H-A) ( ⁇ B) ⁇ , or ⁇ ( ⁇ H) ( H-A) ( ⁇ A) ( ⁇ B) ⁇ , or combinations of the three complexes is inversely proportional to the amount of analyte (A) in the sample, whereas the amount of ⁇ ( ⁇ A)(A) ⁇ and ⁇ ( ⁇ B)(A) ⁇ is directly proportional to the presence of the analyte (A) in the sample.
• analyte (A) If there is sufficient amounts of analyte (A) in the sample, after an appropriate period of incubation, the analyte (A) will have competed sufficiently to bind the anti-analyte (A) antibodies to give complexes ⁇ ( ⁇ A)(A) ⁇ and ⁇ ( ⁇ B)(A) ⁇ thereby limiting formation of the complexes ⁇ ( ⁇ H)(H-A) ( ⁇ A) ⁇ , or ⁇ ( ⁇ H) (H-A)( ⁇ B) ⁇ , or ⁇ ( ⁇ H) (H- A)( ⁇ A)( ⁇ B ⁇ .
• the analyte (A) is not present in the test sample.
• a structurally related substance (X) to analyte (A) can be present which ( ⁇ B) has specificity for but which ( ⁇ A) does not.
• the structurally related substance (X) binds ( ⁇ B) while ( ⁇ A) forms the complex ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ . Subsequent separation of the complexes and detection can occur.
• the analyte (A) is not present in the test sample.
• a structurally related substance (X) to analyte (A) can be present which ( ⁇ A) has specificity for but ( ⁇ B) does not.
• the structurally related substance (X) binds ( ⁇ A) while ( ⁇ B) forms the complex ⁇ ( ⁇ H)(H-A)( ⁇ B) ⁇ . Subsequent separation of the complexes and detection can occur.
• the above assays in the dual antibody format can be conducted in a competitive assay format as described above.
• the above assays can also be presented in an agglutination assay format.
• Both competitive and agglutination assay formats can be presented whereby the anti-hapten antibody ( ⁇ H) can be coated or attached to a particle, preferably a microparticle. In agglutination assays, no separation steps are required.
• the formation of the complexes ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ , ⁇ ( ⁇ H)(H-A)( ⁇ B) ⁇ , ⁇ ( ⁇ H)(H-A)( ⁇ A)( ⁇ B) ⁇ , or combinations of the three complexes can be visually detected in the agglutination of the coated particles.
• the addition of ( ⁇ B) to the assay allows for the detection or measurement of an amount of analyte (A) in a test sample containing interfering substance (X) which one of either anti-analyte antibodies ( ⁇ A) or ( ⁇ B) show cross reactivity to the interfering substance (X), thereby preserving assay integrity by eliminating false positives.
• a direct agglutination assay for the analyte with multiple epitopes using particles coated with anti-hapten antibodies (P- ⁇ H), conjugates of hapten and antibodies against the analyte (H- ⁇ A), the degree of agglutination of the coated particles is directly proportional with the presence of the analyte in the sample.
• P- ⁇ H anti-hapten antibodies
• H- ⁇ A conjugates of hapten and antibodies against the analyte
• the degree of agglutination of the coated particles is directly proportional with the presence of the analyte in the sample.
• an immunoassay method for detecting and measuring an antibody ( ⁇ A) in a sample, by exposing the sample to anti-hapten antibodies ( ⁇ H), and hapten conjugated to antigen to which the antibody binds (H-Ag), and labeled antibody ( ⁇ A*).
• ⁇ H anti-hapten antibodies
• H-Ag hapten conjugated to antigen to which the antibody binds
• ⁇ A* labeled antibody
• a direct agglutination assay for antibodies ( ⁇ A) in a sample which exposes the sample to particles coated with anti-hapten antibodies (P- ⁇ H), and conjugates comprising haptens and antigens to the antibodies (H-Ag). Agglutination of the coated particles is directly proportional to the amount of antibodies in the sample.
• multi-analyte assays and assay devices which employ anti-hapten antibodies. Reagents and kits for conducting all the above assays, for example dyed fixed erythrocytes coated with anti-hapten antibodies, are also disclosed herein.
• the invention can be practiced in formats that include: homogenous, sandwich, competitive, and agglutination assay formats.
• sandwich or competitive assay formats the anti-hapten antibodies can be attached to a solid phase, thus rendering the solid phase into a generic solid phase that can be used to assay different analytes.
• Materials for solid phase can be any of those used for immunoassays.
• Natural, synthetic or naturally occurring materials that are synthetically modified can be used. They include: polysaccharides, e.g., cellulose materials including paper, cellulose and cellulose derivatives such as cellulose acetate and nitrocellulose; silica; fiberglass; inorganic materials such as deactivated alumin, diatomaceous earth or other inorganic finely divided material uniformly dispersed in a porous polymer matrix made of polymers such as vinyl chloride, vinyl chloride-propylene copolymer, and vinyl chloride-vinyl acetate copolymer; cloth, both naturally occurring (e.g., cotton) and synthetic (e.g., nylon); porous gels such as silica gel, agarose, dextran and gelatin; polymeric films such as polyacrylamide; magnetic particles; microtitre plates; polystyrene tubes; protein binding membranes; agarose; Sephadex (Pharmacia Fine Chemicals, Inc.
• One embodiment of the invention presents a competitive assay format wherein the sample for which the analytes are to be assayed is mixed with hapten-analyte conjugate (H-A) and antibodies to the specific analytes to be assayed (anti-analyte antibodies, ⁇ A).
• the anti-analyte antibodies are labeled for detection, e.g. with enzyme, radioactive, fluorescent, or chemical labels.
• the mixture is then passed over the solid phase, to which anti-hapten antibodies have been attached, and incubated for a sufficient time to allow the complex of ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ to form.
• the unbound reagents are separated, e.g.
• the unbound reagents are dissolved in an aqueous medium and washed away from the solid phase and the formation of the complex of ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ on the solid phase is detected by detecting the labeled ( ⁇ A). If the analyte is not present, the complex will be present. If the sample contains the analytes, the analytes will bind the labeled anti-analyte antibodies, and no complex will be present, or the amount of complexes will be reduced. Thus, the presence of the complex is inversely proportional to the analyte concentration in the sample. Alternatively, one can assay for the presence of the remaining unbound labelled ( ⁇ A) in the aqueous medium. Methods for conducting a competitive assay, including the wash step, are well known in the art, see e.g. Mochida et al., U.S. Pat. No. 4,185,084.
• Another embodiment of the present invention presents a dual antibody format for detecting the presence or measuring an amount of an analyte (A).
• the dual antibody format involves the method of utilizing two or more antibodies ( ⁇ A and ⁇ B) of different specificities for analyte (A). This detection or measurement can occur in the presence of interfering substances (X).
• interfering substances (X) can be structurally related substances to which one of the antibodies ( ⁇ A or ⁇ B) in the dual antibody format can show some degree of cross reactivity.
• the analyte (A) is attached directly or indirectly to a particle, e.g., a microparticle, to form a microparticle-analyte (P-A).
• analyte (A) and a structurally related analyte (X) are not present in the test sample, an agglutination reaction occurs due to complex formation between the microparticle-analyte conjugate (P-A) and the antibodies ( ⁇ A and ⁇ B).
• the analyte can be attached to the microparticle either directly or indirectly. Techniques and procedures of coating the microparticles are known to those skilled in the art.
• the analyte (A) is detected when it is present in the test sample.
• the analyte (A) will compete with (P-A) for ( ⁇ A) and ( ⁇ B), to form the complexes of ⁇ ( ⁇ A)(A) ⁇ and ⁇ ( ⁇ B)(A) ⁇ .
• A)( ⁇ B) ⁇ , or ⁇ (P-A)( ⁇ A)( ⁇ B) ⁇ or combinations of the three complexes is then separated from the complexes of ⁇ ( ⁇ A)(A) ⁇ and ⁇ ( ⁇ B)(A) ⁇ . The presence of any of the complexes can then be detected or measured.
• the amount of ⁇ (P-A)( ⁇ A) ⁇ , or ⁇ (P-A)( ⁇ B) ⁇ , or ⁇ (P-A)( ⁇ A)( ⁇ B) ⁇ or combinations of the three complexes is inversely proportional to the amount of analyte (A) in the test sample, whereas the amount of ⁇ ( ⁇ A)(A) ⁇ and ⁇ ( ⁇ B)(A) ⁇ is directly proportional to the presence of the analyte (A) in the test sample.
• analyte (A) If there is sufficient amounts of analyte (A) in the test sample, after an appropriate period of incubation, the analyte will have competed sufficiently to bind the anti-analyte antibodies ( ⁇ A and ⁇ B) to give complexes ⁇ ( ⁇ A)(A) ⁇ and ⁇ ( ⁇ B)(A) ⁇ to effectively prevent enough formation of the complexes
• Another embodiment of the dual antibody format includes the situation whereby the analyte (A) is not present in the test sample.
• a structurally related substance (X) can be present which ( ⁇ A) has specificity for but which ( ⁇ B) does not.
• the structurally related substance (X) binds ( ⁇ A) and forms a complex ⁇ ( ⁇ A)(X) ⁇ while ( ⁇ B) forms the complex ⁇ (P-A)( ⁇ B) ⁇ .
• the analyte (A) is not present in the sample.
• a structurally related substance (X) can be present which ( ⁇ B) has cross reactivity for but which ( ⁇ A) does not.
• the antibody ( ⁇ B) cross reacts with structurally related substance (X) while (aA) forms the complex ⁇ (P- A)( ⁇ A) ⁇ .
• Another aspect of the present invention presents a dual antibody format for detecting the presence or measuring an amount of an analyte (A).
• the dual antibody format involves the method of utilizing two or more antibodies ( ⁇ A and ⁇ B) of different specificities for analyte (A). This detection or measurement can occur in the presence of interfering substances (X).
• interfering substances (X) can be structurally related substances to which one of the antibodies ( ⁇ A or ⁇ B) in the dual antibody format can show some degree of cross reactivity.
• anagglutination reaction occurs due to complex formation between the anti-hapten antibody ( ⁇ H), hapten-a alyte conjugate (H-A), and the antibodies ( ⁇ A and ⁇ B).
• the antibodies specific for analyte (A) bind the analyte in the conjugate thereby allowing agglutination of the complexes.
• the complexes formed in the agglutination reaction are ⁇ ( ⁇ H) (H-A) ( ⁇ A) ⁇ , or ⁇ ( ⁇ H) (H-A) ( ⁇ B) ⁇ , or ⁇ ( ⁇ H) (H-A)( ⁇ A) ( ⁇ B ) ⁇ or combinations of the three complexes.
• One or both anti-analyte antibodies ( ⁇ A and ⁇ B) can be labelled for detection, e.g. with enzyme, radioactive, fluorescent, or chemical labels.
• the antibodies in the dual antibody format can be either monoclonal or polyclonal.
• the preferred embodiment is where the second antibody is a monoclonal.
• ⁇ C ⁇ C with a different specificity to an analyte (A)
• X interfering substance
• the third antibody ( ⁇ C) can be added to bind an interfering substance (X) even if the interfering substance would not prevent agglutination of complexes by either or both antibodies ( ⁇ A or ⁇ B).
• any additional antibodies added in the dual antibody format e.g.,( ⁇ C) can be either polyclonal or monoclonal, more preferably monoclonal.
• the analyte (A) is detected when it is present in the test sample.
• the analyte (A) will compete with (H-A) for ( ⁇ A) and ( ⁇ B), to form the complexes of ⁇ ( ⁇ )(A) ⁇ and ⁇ ( ⁇ B)(A) ⁇ .
• ⁇ ( ⁇ H) (H-A) ( ⁇ B) ⁇ , or ⁇ ( ⁇ H) (H-A)( ⁇ A) ( ⁇ B) ⁇ or combinations of the three complexes is then separated from the complexes of ⁇ ( ⁇ A)(A) ⁇ and ⁇ ( ⁇ B)(A) ⁇ .
• the presence of any of the complexes can then be detected or measured.
• analyte (A) in the test sample, after an appropriate period of incubation, the analyte will have competed sufficiently to bind the anti-analyte antibodies ( ⁇ A and ⁇ B) to give complexes ⁇ ( ⁇ A)(A) ⁇ and ⁇ ( ⁇ B)(A) ⁇ to effectively prevent enough formation of the complexes ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ , or ⁇ ( ⁇ H)(H-
• the assay gives a positive result upon detection.
• PCP phencyclidine
• ⁇ A antibody
• ⁇ ( ⁇ PCP1 )(PCP) ⁇ and/or ⁇ ( ⁇ PCP2)(PCP) ⁇ is directly proportional to the amount of the PCP in the test sample.
• another embodiment of the dual antibody format includes the situation whereby the analyte (A) is not present in the test sample.
• a structurally related substance (X) can be present which ( ⁇ A) has specificity for but which ( ⁇ B) does not.
• the structurally related substance (X) binds ( ⁇ A) and forms a complex ⁇ ( ⁇ A)(X) ⁇ while ( ⁇ B) forms the complex ⁇ ( ⁇ H)(H-A)( ⁇ B) ⁇ . Even if there is sufficient amounts of structurally related analyte (X) to bind all of the antibody ( ⁇ A), antibody ( ⁇ B) will still form a complex with (H-A) and ( ⁇ H). Subsequent separation of the complexes and detection of the reaction gives a negative reaction for the analyte (A).
• the structuraly related substance (X) can be the methadone metabolite 2-ethylidene-1 ,5-dimethyl-3,3-diphenylpyrrolidine (EDDP) and the analyte (A) can be PCP.
• EDDP methadone metabolite 2-ethylidene-1 ,5-dimethyl-3,3-diphenylpyrrolidine
• A can be PCP.
• Both antibodies ⁇ A antibody would be ⁇ PCP1 and ⁇ B would be ⁇ PCP2
• PCP an analyte
• ⁇ PCP1 has crossreactivity to structurally related substance (EDDP).
• the presence of (EDDP) in the test sample causes ( ⁇ PCP1 ) to bind EDDP thereby leaving ( ⁇ PCP2) to form the complex ⁇ ( ⁇ H)(H-PCP)( ⁇ PCP2) ⁇ .
• the amount of complex ⁇ ( ⁇ H)(H-PCP)( ⁇ PCP2) ⁇ formed is inversely proportional to the amount of analyte (PCP) in the test sample.
• the analyte (A) is not present in the sample.
• a structurally related substance (X) can be present which
• ( ⁇ B) has cross reactivity for but which ( ⁇ A) does not.
• the antibody ( ⁇ B) cross reacts with structurally related substance (X) while (aA) forms the complex ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ .
• the structurally related substance (X) can be dextromethorphan and the analyte (A) can be PCP.
• ⁇ ( ⁇ H)(H-PCP)( ⁇ PCP1 ) ⁇ The amount of complex ⁇ ( ⁇ H)(H-PCP)( ⁇ PCP1 ) ⁇ formed is inversely proportional to the amount of analyte (PCP) in the test sample.
• Analytes suitable for detection and/or measurement by the dual antibody format include low molecular weight substances, e.g., steroids such as testosterone, steriol, progesterone, corticosterone, aldosterone; thyroid hormones such as thyroxine and triiodothyronine; physiologically active peptides e.g., steroids such as testosterone, steriol, progesterone, corticosterone, aldosterone; thyroid hormones such as thyroxine and triiodothyronine; physiologically active peptides e.g.
• steroids such as testosterone, steriol, progesterone, corticosterone, aldosterone
• thyroid hormones such as thyroxine and triiodothyronine
• physiologically active peptides e.g.
• bradykinin angiotensin, thyroid hormone-releasing hormone, and luteinizing hormone-releasing hormone
• physiologically active amines such as epinephrine, norepinephrine, histamine, and serotonin
• prostaglandin relatively low molecular weight substances, e.g., insulin, glucagon, adrenocorticotropic hormone, and gastrin
• high molecular weight substances e.g., human chorionic gonadotropin, growth hormone, human placental lactogen, immunoglobulin E, alpha-fetoprotein, hepatitis B antigen.
• the analyte can be a hapten, an antigen, or an antibody.
• antigens examples include antigens of micro-organisms such as human immunodeficiency virus (HIV) antigens, tumor-specific antigens, cell or tissue antigens, and serum antigens.
• HIV human immunodeficiency virus
• the analyte is preferably small molecules such as therapeutic drugs, drugs of abuse, and toxins.
• the dual antibody format assays can be conducted in a competitive assay format as described above.
• the dual antibody format assays can also be presented in an agglutination assay format.
• an analyte or an analyte analog can be attached directly or indirectly to a particle, e.g., a microparticle.
• Another embodiment of the dual antibody format can be conducted in both competitive and agglutination assay formats whereby the anti-hapten antibody is coated onto a particle, preferably a microparticle. In agglutination assays, no separation steps are required.
• the present invention presents the following advantages:
• the anti-hapten coated particle (P- ⁇ H) is a generic reagent, which can be used in a variety of tests.
• the assay format makes it possible to run multi-analyte tests, i.e. to perform multiple tests simultaneously with a single specimen.
• the present invention offers the advantages of simplicity, rapidity, clarity, economy, sensitivity and specificity.
• the agglutination assays presented here allow for visual detection of the result and do not involve wash and separation steps. Whereas the prior art agglutination assays require particles that are sensitized to the specific analyte to be detected and do not provide for multi- analyte tests; the present invention allows for the performance of multi-analyte tests with a single specimen, and the use of a generic reagent for different tests.
• the preferred configuration for one format is as follows: There are four major components in the system, the microparticle coated with an anti-hapten antibody (P- ⁇ H), the hapten-analyte conjugate (H-A), the anti- analyte antibody ( ⁇ A) and the specimen containing the analyte (A). In the absence of the analyte (A), agglutinates of complexes of ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ are formed. This results in agglutination (see Fig. 1 ).
• One configuration in the dual antibody format is as follows: There are three major components in the system, a particle, e.g., a microparticle coated with analyte or analyte-analog (P-A), the anti-analyte antibodies ( ⁇ A and ⁇ B), and the specimen containing the analyte (A). In the absence of the analyte (A), agglutinates of complexes ⁇ (P-A)( ⁇ A) ⁇ or ⁇ (P-A)( ⁇ B) ⁇ , or ⁇ (P-A)( ⁇ A)( ⁇ B) ⁇ or combinations of the three are formed. The complexes result in agglutination.
• a particle e.g., a microparticle coated with analyte or analyte-analog (P-A)
• the anti-analyte antibodies ⁇ A and ⁇ B
• the specimen containing the analyte (A) the specimen containing the ana
• the dual antibody format has the advantage of preserving assay integrity by adding at least two antibodies with different specificities for analyte (A). By doing so, either ( ⁇ A) or ( ⁇ B) can cross react with an interfering substance for which they have some cross reactivity to while the other antibody continues to bind the analyte (A) if present in the test sample or bind (M-A) if analyte (A) is not present in the test sample.
• Another configuration in the dual antibody format is as follows:
• the microparticle coated with an anti-hapten antibody P- ⁇ H
• the hapten-analyte conjugate H-A
• the anti- analyte antibodies ⁇ A and ⁇ B
• the specimen containing the analyte A.
• analyte (A) agglutinates of complexes of ⁇ ( ⁇ H)(H-A)( ⁇ A) ⁇ are formed. This results in agglutination (see Fig. 1 ).
• the dual antibody format has the advantage of preserving assay integrity by adding at least two antibodies with different specificities for analyte (A).
• either ( ⁇ A) or ( ⁇ B) can cross react with an interfering substance for which they have some cross reactivity to while the other antibody continues to bind the analyte (A) if present in the test sample or bind ( ⁇ H)(H-A) if analyte (A) is not present in the test sample.
• Figure 5 shows the agglutinations in the cases of: negative, threshold, and positive reactions.
• hapten-anti-hapten pairing can be replaced with ligand-receptor pairings; biotin-avidin pairings; pairings of complementary nucleic acids; and any pairing that would allow for agglutination.
• One aspect of the invention can be conducted on a multi-chamber agglutination device.
• Each chamber is specific for detecting a specific analyte, and contains a reagent specific for that particular analyte.
• the device preferably allows the sample/reaction mixture to simultaneously flow into each chamber and to react within the chamber, but does not allow the reverse flow or intermixing of the reaction mixture in one chamber with that of the other chambers.
• the test for a given analyte (A x ) requires specific conjugate (H-A x ) and anti-
• Ax antibody ( ⁇ A x ), and at least a second anti-A x antibody ( ⁇ B x ) when utilizing the dual antibody format.
• the coated particle (P- ⁇ H) however, is common for all analytes in this test format, and becomes a generic reagent in the system.
• one or both of the analyte-specific components (H- A x ) or ( ⁇ A x ) can be pre-packaged in respective chambers for each analyte in a manifold-chamber device.
• the additional antibody with specificity for analyte A x can also be pre-packaged in respective chambers.
• the preferred devices are disclosed in U.S. Patent Applications Serial No. 138,253, filed on December 23, 1987, entitled "Agglutination Reaction Device" to Parsons, R.G., et al.; Serial No.
• FIGS 3A and 3B show two views of a multi-channel device.
• different hapten- analyte conjugate (H-A) is contained within each channel.
• the conjugates (H-A) bear the specific analytes to be detected in that particular chamber.
• the base of the chamber can be made of the any of the solid phase materials described above.
• the device contains means for introducing a portion of the sample into each chamber and mixing it with the conjugates to form a mixture and yet preventing the mixture from entering another chamber.
• the device would also contains means for allowing the unbound reagents to be separated from the complex bound to the solid phase.
• the device similarly allows the wash solution to enter and exit each chamber carrying with it the unbound reagents, and yet does not allow the wash solution with the unbound reagents to enter another chamber.
• the same means that separate the sample mixture in one chamber from the other may be used.
• a simple microtiter well plate with anti-hapten antibodies bound to its wells could be used to carry out the competitive assay format, as exemplified in Example 13 below.
• an agglutination format is utilized for the multi-analyte assay.
• the H-A conjugates can be dissolved in an aqueous solution, and spotted onto the base of each of the channels and allowed to dry before the sample mixture is introduced, see e.g. Example 10 below.
• the mixture containing the specimen, the coated particle (P- ⁇ H), the ( ⁇ A x 's), and ( ⁇ B x 's) if utilizing the dual antibody format, are introduced to the sample loading zone. As a portion of the mixture flows into the individual channels, the specific conjugates become mixed to form complete reaction mixtures in each channel.
• the agglutination reaction does not start until the reaction mixture is completed by the combination of microparticles coated with antihapten antibodies, hapten-analyte conjugate, and anti-analyte antibody or antibodies.
• test configurations can be realized. All versions can be implemented as the panel test format, as well as the single test format.
• the analyte includes low molecular weight substances, e.g., steroids such as testosterone, steriol, progesterone, corticosterone, aldosterone; thyroid hormones such as thyroxine and triiodothyronine; physiologically active peptides e.g., steroids, such as testosterone, steriol, progesterone, corticosterone, aldosterone; thyroid hormones such as thyroxine and triiodothyronine; physiologically active peptides e.g.
• steroids such as testosterone, steriol, progesterone, corticosterone, aldosterone
• thyroid hormones such as thyroxine and triiodothyronine
• physiologically active peptides e.g.
• bradykinin angiotensin, thyroid hormone-releasing hormone, and luteinizing hormone-releasing hormone
• physiologically active amines such as epinephrine, norepinephrine, histamine, and serotonin
• prostaglandin relatively low molecular weight substances, e.g., insulin, glucagon, adrenocorticotropic hormone, and gastrin
• high molecular weight substances e.g., human chorionic gonadotropin, growth hormone, human placental lactogen, immunoglobulin E, alpha- fetoprotein, hepatitis B antigen.
• the analyte can be a hapten, an antigen, or an antibody.
• antigens examples include antigens of micro-organisms such as human immunodeficiency virus (HIV) antigens, tumor-specific antigens, cell or tissue antigens, and serum antigens.
• HIV human immunodeficiency virus
• the analyte is preferably small molecules such as therapeutic drugs, drugs of abuse, and toxins.
• the particles are preferably microparticles that are visually detectable, colored microparticles which enable a direct visual readout of the presence or concentration of the analyte in the test sample without the need for using additional signal producing reagents.
• Materials for use as such particles include colloidal metals, such as gold and dyed particles as disclosed in U.S. Patent Numbers
• Non-metallic colloids such as colloidal selenium particles
• Organic polymer latex particles can also be used. They are disclosed in co-owned and copending U.S. Patent Application Serial No. 248,858, filed September 23, 1988, which is incorporated by reference herein.
• Other particles of natural or organic polymers can also be used.
• Other preferred particles are cells which can agglutinate, e.g., erythrocytes, preferably fixed erythrocytes such as DuracyteTM cells (Abbott Laboratories, North Chicago, Illinois). An example of how the erythrocytes can be fixed (i.e. stabilized) is shown in J. Immunology. 1 00
• the selection of a particular particle is not critical, so long as the particle is capable of agglutination and such agglutination can be visually detected.
• Anti-hapten antibody is attached to the particle via covalent binding and/or adsorption using known methods.
• particles such as latex particles can be passively coated with the antibodies (Hadfield, et al., J. Imm. Methods, supra)
• the method for coating antibodies onto selenium particles disclosed in the Examples below can also be used to coat other metal particles, such as gold particles.
• other metal particles such as gold particles.
• an alternative method see e.g. the method disclosed in U.S. Patent 5,075,100 to Seno, for preparing iron colloid-labeled antibodies.
• the hapten can be any small molecule capable of eliciting immune responses in laboratory animals, usually when conjugated to a protein. Preferably, the hapten only has one antigenic site. Examples of these haptens are fluorescein, rhodamine, biotin, and dinitrophenyl groups.
• Anti-hapten antibodies can be produced with methods known in the art, and the antibodies can be polyclonal or monoclonal antibodies. Polyclonal antibodies can be produced for example, by injecting a host animal such as rabbit, rat, goat, mouse etc. with the hapten. Before injection, the hapten can be first conjugated with carriers such as keyhole limpet hemocyanin or bovine serum albumin. Monoclonal antibodies can be produced, e.g.
• the antibodies can also be recombinant monoclonal antibodies, for example, produced according to the methods disclosed in Reading U.S. Patent 4,474,893, or Cabilly et al., U.S. Patent 4,816,567.
• antibody fragments such as Fab, F(ab')2 , and Fv fragments. Such fragments can be produced by known techniques.
• the Hapten-Analyte Conjugates The hapten-analyte conjugates, such as fluorescein-analyte conjugates are commercially available for the commonly assayed analytes, for example they are used as the tracers in Abbott Laboratories' TDX's FPIA (commercially available from Abbott Laboratories, Abbott Park, IL).
• the hapten-analyte conjugates can also be produced according to methods known in the art, such as disclosed in U.S. Pat. No. 4,668,640 to Wang et al.
• a. Competitive Assay (Fi ⁇ s. 1 & 2).
• Members of the immunoreaction consist of the microparticle coated with anti-hapten antibody, the hapten-analyte conjugate, the anti-analyte antibody or antibodies and specimen.
• the analyte in the specimen competes with the hapten-analyte conjugate for the anti-analyte antibody or antibodies.
• the more analytes that are present in the specimen the less the anti-analyte antibodies will be available for agglutination; and vice versa.
• the observed agglutination is inversely proportional to the analyte concentration in the specimen.
• b. Direct Sandwich assay for antibody for antibody.
• the configuration can also be arranged to test for antibodies (Ab).
• the antibodies of interest become the analytes.
• the sample is mixed with the anti-hapten antibody coated microparticles (P-vH), and conjugates of the haptens with antigens for which the antibodies of interest are specific for (H-Ag).
• the concentration of antibodies in the sample is directly proportional to the amount of agglutination caused by the formation of complexes of ⁇ (P- ⁇ H)(H-Ag)(Ab) ⁇ (as shown in Figure 4).
• the present invention also presents dyed erythrocytes, preferably dyed fixed erythrocytes, to enhance visualization of the agglutination process.
• U.S. Pat. No. 4,745,075, to Hadfield et al., in column 3 has suggested dyeing erythrocytes that are used agglutination assays.
• German Patent Application DT-3000-483 and that particularly suitable colors include red, yellow, blue, green, black, cyan, magenta, and white.
• the current invention presents erythrocytes which can be dyed, for example, red, green or blue.
• the dyed erythrocytes preferably fixed erythrocytes such as the commercially available DuracyteTM cells, can be coated with antibodies and the antibodies still maintain their abilities to bind their antigens and cause agglutination of the dyed erythrocytes.
• Dyed particles can be used at lower concentrations than their non-dyed counterparts with comparable performance.
• the dyes firmly adhere to the cells and do not leach into the surrounding assay solution.
• the preferred dyes for cells such as fixed erythrocytes are: Cibachrome Blue 3GA (Sigma
• Reactive Color Series from Sigma Chemical Co., such as Reactive Red, Reactive Green, Reactive Yellow, etc.
• diazonium dyes such as Fast Black K, Fast Blue B from Sigma Chemical Co., St. Louis, MO
• organic dyes with lodoacetamide or maleimide coupling chemistry e.g. Rhodamine iodoacetamide,
• Rhodamine maleimide Eosine iodoacetamide, Eosine maleimide
• Tetramethylrhodamine maleimide and Tetramethylrhodamine iodoacetamide.
• an important feature of the above listed dyes is that they couple to the erythrocytes via functional groups other than amino groups, since the erythrocytes have no or very few free amino groups available for binding dye.
• the most preferred dyes are those which covalently bind to the erythrocytes, preferably fixed erythrocytes.
• the intensities of the colors of the different particles are preferably balanced to achieve good differentiation between agglutination and lack thereof.
• the dyed particles can be used in the above agglutination reactions where two or more populations of particles (of different colors) can be mixed to perform multiple assays.
• the different colored particles are preferably present in about equal amounts. Reactions with either of the populations of particles cause an overall change in the color of the solution which can be easily visualized.
• other colored particles can be used, for example, differently colored latex and plastic particles. This greatly enhances one's ability to read these tests and allows for multiple tests to be run simultaneously.
• the invention poses an advantage over prior art where each individual assay and control are run separately, incurring extra time and labor.
• DuracyteTM cells A 10% suspension of DuracyteTM cells was prepared in 50 mM NaOH. Cibacron Blue 3GA (Sigma Chemical Co., St. Louis, MO) was added to the suspension to a final concentration of 50 mg/ml. The suspension was allowed to mix at room temperature for 1.5 hours. The cells were similarly centrifuged and washed as in Example 1 . The resultant cell suspension had a dark blue color.
• a 10% (v/v) suspension of DuracyteTM cells were coated with affinity- purified rabbit anti-fluorescein at a concentration of 100 ⁇ g/mL in the presence of .05% (w/v) chromic chloride in .1 M sodium acetate buffer at pH 4.0.
• the suspension was incubated at 30°C for 1 hour with occasional mixing via inverting the reaction test tube. After centrifugation (1000 xG, 1 min), the cells were washed two times with 8X Volume of PBS and then incubated with 1 % (w/v) human serum albumin (Sigma Chemical Co., St. Louis, MO) in 25 mM Tris/HCI buffer (pH 8.0) at room temperature for 30 minutes. The cells were finally resuspended in PBS (see
• Example 1 to a final cell concentration of 10% (v/v).
• Phencyclidine-fluorescein conjugate (PCP tracer from TDx PCP Reagent Kit, Abbott Laboratories, supra) was mixed with a stock preparation of anti-fiuorescein- coated selenium (see Example 5) at a concentration of 0.04% (%). Thirty ⁇ l of the mixture was aliquoted into each of 4 test tubes. Five ⁇ l of urine samples containing 0, 25, 60, and 120 ng/mL phencyclidine were added to each of the test tubes. Then 5 ⁇ l of anti-phencyclidine antibody (TD X PCP antisera from TD X PCP Reagent Kit, Abbott Laboratories, supra) was added.
• Tests for opiates, cannabinoids, cocaine and Thyroxine (T4) were analogously configured except that serum instead of urine samples were used in the case of T4. the results all showed increased OD 550 with increasing concentration of analytes.
• An antisera cocktail was made by mixing 20 ⁇ lfrom each of the three antisera solutions (Antisera solutions from TDx reagent kits) from each of the same three assay kits along with 16 ⁇ l of a 10% suspension of anti-fluorescein coated Blue DuracyteTM cells (Examples 2 and 4), and 64 ⁇ l Duracyte Buffer (Example 7).
• This cocktail 140 ul was mixed with 40 ⁇ l of a normal (drug free) urine sample and 45 ⁇ l aliquots of the resultant solution were added to the laminated reaction cards and from there the solution flowed (through capillary action) into the channels having each of the three respective tracers. Within 5 minutes strong agglutination patterns were visible in each of the three channels.
• This experiment was repeated using samples which contained various concentrations of either Benzoylecognine, morphine, or PCP and the results are presented in the Table below:
• Cibacron Blue 3GA-stained fixed human erythrocytes were coated with monoclonal anti-HBsAg at a final concentration of 120 ⁇ g/ml using the procedure described in Example 4.
• the coated cells were suspended in Duracyte buffer (Example 7) at a final concentration of 10% (v/v).
• These cells 25 ⁇ L were mixed with 25 ⁇ L of either serum containing 12 ng/ml HBsAg or serum without any HBsAg (25 ⁇ L) and added to the channels of laminated reaction cards (Example 7).
• the cells mixed with serum containing HBsAg formed strong agglutinates whereas the cells mixed with serum without HBsAg did not agglutinate.
• DuracytesTM cells agglutinated and were clearly visible against a pink background (unagglutinated red DuracyteTM cells).
• the gray- colored suspension remained as uniform color and did not show signs of agglutination.
• Affinity purified anti-fluorescein is diluted with buffer (10 mM Tris-HCI, pH 9.0, 150 mM NaCI) to a final concentration of 50 ⁇ g/mL. 100 ⁇ L aliquots of this material is incubated in each of the wells of a 96 well microtiter plate for 12 hr at 37 °C. The non-bound anti-fluorescein is next aspirated from the wells, and the wells are washed five times with 100 ⁇ L amounts of PBS containing 0.1% BSA. At this point the microtiter plate wells contain an adsorbed, non-soluble coating of anti- fluorescein (coated microtiter plate).
• Analogous assays for other drugs are performed in other wells of the same coated microtiter plate by adding samples containing mixtures of specific fluorescein conjugates of those drugs and their respective enzyme-labeled antibody pairs, in the place of the PCP-fluorescein and the enzyme- labeled anti-PCP used in the example above.
• EXAMPLE 14 Aliquots (1.5 ⁇ L) of fluorescein-drug tracer solutions for amphetamines, cannabinoids, cocaine, opiates, and PCP (from the respective TDx assay kits available from Abbott Laboratories, supra) are placed and dried in channels 2-6 of the laminated reaction card ( Figures 3A and 3B show two views of the card). For a negative control, another 1.5 ⁇ L of Fluorescein labeled BSA (Sigma Chemicals, St.
• an antisera cocktail with anti-fluorescein coated Duracyte cells is prepared as described in Example 10, however, additional antisera directed against cannabinoids and amphetamines are also added. A 200 ⁇ L sample of this antibody cocktail is mixed with
• Channel 1 represents a negative reaction reference and it will show a reaction analagous to the negative assays, independent of whether negative or positive samples are run.
• Channels 2-6 provide the individual reactions for each of the 5 drugs (amphetamines, cannabinoids, cocaine, opiates, and
• EXAMPLE 16 These five test samples were tested with samples containg a different structurally related substance, 2-ethyl-5-methyl-3,3-diphenylpyrroline (EMDP), without PCP. The same antibodies were used as in Example 15. The reaction strengths of the assays were determined visually using a semi-quantitative scoring system where 0.5
• Example 16 Some of the same antibodies in Example 16 were tested for their ability to analyze two different levels of PCP as well as their specificity to EDDP and dextromethorphan in the absence of PCP.
• the monoclonal antibodies were then individually mixed 50:50 with the polyclonal and tested against the same analyte and interfering substances.
• the assay threshold for samples is set at 25 ng/ml of PCP. Accordingly, samples listed in the 0.5PCP are at half the PCP threshold and therefore should show agglutination. Conversely, samples at the 1 .5PCP concentration should show little or no agglutination.

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